Change assert signature to try TS 3.7 features
Change assert signature to try TS 3.7 features

stefanpenner/ember.js,tildeio/ember.js,knownasilya/ember.js,emberjs/ember.js,elwayman02/ember.js,elwayman02/ember.js,mixonic/ember.js,sandstrom/ember.js,knownasilya/ember.js,sandstrom/ember.js,sly7-7/ember.js,emberjs/ember.js,elwayman02/ember.js,stefanpenner/ember.js,elwayman02/ember.js,stefanpenner/ember.js,tildeio/ember.js,knownasilya/ember.js,sly7-7/ember.js,mixonic/ember.js,sandstrom/ember.js,emberjs/ember.js,tildeio/ember.js,mixonic/ember.js,sly7-7/ember.js